Python django queryset选择相关的。value（）重命名键

使用python3.4 django 2.0.2

models.py

class Userinfo(models.Model):

    useruid = models.BigAutoField(db_column='UserUID', primary_key=True)

    useremail = models.CharField(
            db_column='UserEmail', unique=True, max_length=100)
    userpassword = models.CharField(db_column='UserPassword', max_length=128)

    passwordsalt = models.CharField(db_column='PasswordSalt', max_length=128)
    userstatus = models.IntegerField(db_column='UserStatus', default=0)
    username = models.CharField(
        db_column='UserName', max_length=100, default=0)
    class Meta:
        managed = False
        db_table = 'userinfo'

class Postinfo(models.model):
    postuid = models.BigAutoField(db_column='PostUID', primary_key=True)
    content = content = models.TextField(db_column='Content')
    useruid = models.ForeignKey(
    Userinfo, db_column='UserUID', on_delete=models.CASCADE)

    class Meta:
         managed = False
         db_table = 'postinfo'

queryset

postquery = models.Postinfo.objects.all().select_related("useruid").order_by(
                '-postuid')

postquery是

<QuerySet [{'content': 'test','postuid': 1, 'useruid_id': 1},OtherPosts...>

userinfoquery是

 <QuerySet [{'useruid_id__username': 'firstuser','useruid_id__userstatus': 0, 'useruid_id': 1},OtherUsers...>

此代码引发异常

QuerySet.annotate() received non-expression(s): useruid_id, useruid_id__uesrname, useruid_id__userstatus.

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如何删除Django 1.11以来的useruid\u id\u

您可以将表达式与

值一起使用（）

，请检查。因此，您需要在查询中添加

F

表达式：

from django.db.models import F
userinfoquery = postquery.values(
                useruid=F("useruid_id"), username=F("useruid_id__username"), userstatus=F("useruid_id__userstatus"))

---

您好，您可以使用注释功能

from django.db.models import F

Postinfo.objects.annotate(renamed_value=F('useruid_id__username')).values('renamed_value')

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引发此异常

注释“useruid”与模型上的字段冲突用户UID不在postquery.values（）中
from django.db.models import F
userinfoquery = postquery.values(
                useruid=F("useruid_id"), username=F("useruid_id__username"), userstatus=F("useruid_id__userstatus"))

from django.db.models import F

Postinfo.objects.annotate(renamed_value=F('useruid_id__username')).values('renamed_value')